Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d445a0e33db33e…

MALICIOUS

PDF

104.8 KB Created: 2021-03-22 04:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9be0503bccc802533a00d602fc4a1a9e SHA-1: a9bdfea0760fbd47c0379c97bcb6800428288717 SHA-256: 16d445a0e33db33e797ad66a9ed9f0ec88d8d2328691ba213c98e71569812985
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, including one that appears to be a search result lure for downloading a book. The presence of these links suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/award?keyword=oxford+translation+book+pdf+download PDF link annotation
    • http://pifemukopisare.sportsontheweb.net/how_to_calculate_height_using_time_and_gravity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5feb5aa778cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_60290130d4508.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/67266412562.pdfIn PDF document text
    • http://nemagufi.mywebcommunity.org/common_tcp_ip_port_numbers.pdfIn PDF document text
    • http://autolombardpro.ru/80443511933cs3yy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff92db440b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_6026b9e177f30.pdfIn PDF document text
    • http://ryursew.space/78978648992xnbip.pdfIn PDF document text
    • http://spain50off.info/abecedario_con_letras_mayusculas_y_minusculas_para_imprimirzzmly.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/28840303452mj3iz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5fe60d0d8dc55.pdfIn PDF document text
    • http://hookup157.fun/gekeruviwerujifotorew1n44q.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/is_fedex_smartpost_trackable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_601fb76a2813c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_6011445445fbd.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/sunglasses_quotes_instagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_6022c1e4401eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/bladestorm_the_hundred_years_war_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/bedtime_stories_read_aloud_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/gym_ball_exercises_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/answers_hq_anthem.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/rectus_abdominis_exercises.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/basic_english_for_beginners.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 5424 bytes
SHA-256: 37d7ad5b25e1eaf65db0570a6a4d9f4a565877e75f492ee1f7734f5536a4ef30
font_01_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 2116 bytes
SHA-256: 1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7
font_03_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 10884 bytes
SHA-256: e6a1506fe8419229f58bb4b7e5f2f94454a426ed860f3cf453ba16131f2a7d6f
font_04_sfnt_off000158d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D6 16080 bytes
SHA-256: 3a0f8ed008c79ef5fc1e40fbe805bb4ed86c3b537cef76351acb51b29d81aea7
font_05_sfnt_off00016dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC8 12620 bytes
SHA-256: 58b326678bb71d8a1fdd5922ef81f4f36d092880a8336c847d078d8881368da9

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